Community Sewage Treatment Plant

Sewage is the liquid waste produced by humans which typically contains washing water, fasces, urine, laundry waste and other liquid or semi-liquid wastes from households and industry. Sewage collection and disposal is usually done via a system of sewer pipes (sewers) called sewerage, and sometimes via a cesspool emptier.

(Overview of STP at Proton City Development Corporation Sdn Bhd at Tanjong Malim Perak Darul Ridzuan)

Sewage treatment, or domestic wastewater treatment, is the process of removing the contaminants from sewage to produce liquid and solid (sludge) suitable to be discharged to the environment or for reuse. It is a form of waste management that involves physical, chemical and biological processes. Typically, sewage treatment produces a waste stream (treated effluent) and also a solid waste stream (sludge).

Sewage treatment involves three basic stages called the primary, secondary and tertiary treatment. Solids are primarily separated from the wastewater stream. Consequently, dissolved biological matter is progressively converted into a solid mass by using indigenous, water-borne bacteria. The biological solids will soon after be neutralized before being dispose of or re-used, while the treated water may be disinfected chemically or physically (via chlorination, UV and/or micro-filtration). The effluent can be discharged into the nearest water bodies, or it can be used for the irrigation of a golf course, greenway or park. In the case that the effluent is sufficiently clean, it can be used for groundwater recharge.